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Derivative Instruments and Hedging Activities - Pre-Tax Gain (Loss) (Detail) (USD $) In Millions, unless otherwise specified | 3 Months Ended
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Mar. 31, 2013 | Mar. 31, 2012
Derivative [Line Items] |  |
Total gain | $ 5 | $ 1
Exchange Contracts [Member] |  |
Derivative [Line Items] |  |
Total gain | 7 | (5)
Forward Contracts [Member] |  |
Derivative [Line Items] |  |
Total gain | 2 | (1)
Metals Contracts [Member] |  |
Derivative [Line Items] |  |
Total gain | $ (4) | $ 7

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- Definition Net Increase or Decrease in the fair value of the derivative or group of derivatives included in earnings. + References Reference 1: http://www.xbrl.org/2003/role/presentationRef -Publisher FASB -Name Accounting Standards Codification -Topic 815 -SubTopic 10 -Section 50 -Paragraph 4A -Subparagraph (b) -URI http://asc.fasb.org/extlink&oid=7476318&loc=SL5618551-113959 + Details
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Data Type: | xbrli:monetaryItemType
Balance Type: | credit
Period Type: | duration

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- Details
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Period Type: | duration